In both $tan A$ and $tan B$ positions in a Deflection Magnetometer, the bar magnet is always placed

parallel to the magnetic needle of the deflection magnetometer

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parallel to the aluminum pointer of the deflection magnetometer

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perpendicular to the aluminum pointer

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parallel to the arm having the wooden scale

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Solution

The correct option is A parallel to the magnetic needle of the deflection magnetometer
In $tan A$ position the bar magnet is placed horizontally, parallel to the arm of the deflection magnetometer and parallel to the magnetic needle of the deflection magnetometer.
In $tan B$ position the bar magnet is placed horizontally, perpendicular to the arm of the deflection magnetometer and parallel to the magnetic needle of the deflection magnetometer.

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In both tanA and tanB positions in a Deflection Magnetometer, the bar magnet is always placed

In both $tan A$ and $tan B$ positions in a Deflection Magnetometer, the bar magnet is always placed